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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0d0c6e1cc24096553f558ff4fd9d997454952cb72403ca0ae08f4c77b7cca9' 
  AND token = '3j72yDXGSeGXvB7ZPMS4AK/FA6T2Hoi4fC7aOXq+x4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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