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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbce75864b86218b4083be85e779776ee655922b4767cfc4152870286b18df4d' 
  AND token = 'BJrRyEPWwPgEoLGEbkp9mpruSAGw3y/a/ksB9br3kvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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