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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64233dd486b245fd5c320e55304c018dd5b8e6aecb3112bb5b6ff8c9f4b72f9' 
  AND token = 'lSx3dRewBWFadisWpJpGs1tEWdYn8vcMJExnYmI44oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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