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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a9709090ffc77f4274745877e73896fd240ae53b412fb8ebf08f998333a187' 
  AND token = 'IlNRRrUMAvtuKtaLAwB9r1W3rfpp877HraP/OMRGpx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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