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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2364d5a1202f92cfb1aca2caaa39fe95466a0e33f864e2a7c08a2334523d959' 
  AND token = 'T4Akg/EGOwFCpabbyc8xqXFKh1/h4cp0QxIeprybCLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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