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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5949a541666a4661d140b5a70cb5a3c830a1b46042a2cf219d9b011b4a97f692' 
  AND token = 'hlh4u1TPg7S18a+/7tYXNEXTwztn6HsfR2HpHQ9sQWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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