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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5773097a77b840157b3eedfefc0b41b5a91b2ab2532d2decd5f69867a38ec0b8' 
  AND token = 'Hogxxu9gcXcs7jK4p2PS66SMesSR7hLYYQBnfto+n6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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