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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b884f5b2ffe29b8ef9abbe42110c2807ebfbbd6109bfbe6ce1f8fb4d1d2e99cf' 
  AND token = 'q6ztzj5KzUdkq9SvJxi1FALlG0fEOF/uyjZpFUPsL0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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