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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd783117cf68ea61dcfa4f5df08a9e1d4655f9884e391e92fd7ef6e580e2918' 
  AND token = 'GEyqsAzD82z/MVRoBlbqPAukS+0t2BMYnMQdeUgezio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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