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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760e5ae3c838f40d6c78bc1ace307e5e240ce7f2b4b59378da07d7e8790d283a' 
  AND token = 'CAIoyk+kZKteznspcL+eGjIUH8mh/Qq1p5wpt9fNK5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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