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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ef3ad6b1161af671471c41a14272a4e8214581cdfbea63c6a472b3ec1913f4' 
  AND token = '4cC8nAFSP4gMLZnYSdM200ZVGKJTrpCZfIR3lrcgwps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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