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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de3beb1951ce0e88bab0b2f02f4bfd23d9a6bf1cfd676880b7d428ef36996fa' 
  AND token = 'N0mJjAY0R4exEdJptDA6jcFTSKtec/WYcCZLuIijM58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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