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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977b813bd350317cedf3072752f30bb738fa0196438c745db0736c15a350116e' 
  AND token = 'cZdXPMl7ntvLWJlMc7Bp5RoSc633LzfqYsDt1A1oXhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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