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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2b5198f0f733fe455575626168616cbcd69d37dea5d1c8312a3c2f9bf14d4e' 
  AND token = 'tCz3IVuS5YSxEzDEY7aJK69PV7ObUkPzt7TjP3ZdYWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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