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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ff2d9795f09ed9596400509798025239c1be91c86b3eb63b8ffe56f3154794' 
  AND token = '2aANy4b+fAzgvkGZwXYANgbuAuPhfLGhIH6rh3kIwy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}