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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ab87e6d411ca3a4f9f0856ba5b9b08ce3e8310022618677dbe9eada885ce75' 
  AND token = 'nbB7yHjIptC2rrkWtBeF2L8lc2wISb64z6gaT7ZipmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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