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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4052a8b480b0166782beac346c75d66843498db4937dae6a233720fbc61ac4c' 
  AND token = 'eQJeMrm0B14i8mOOOsNt78oOD4wxGSaCiUELCUjtvqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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