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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df86a97e718e0386e69789c3730d1a1e2e367198925f387d9c2a4434e6f48309' 
  AND token = '09Y8EcLy5fUX3YQdfRefpf/S2g39C4xXswUUL5WdEHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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