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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2fa28f621d669d2a000022c4541aff9d049922e362191df26b6b027ab6084a' 
  AND token = 'Zo3/EHIv5nhFCAugsPjmk/cmQ4DuE/ep5Sa9GOxb7yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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