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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb15572d11944b0334d98a349673338c9fc76ea1198fe4ab38ea9e19c9def5d6' 
  AND token = 'cvXisMNBwZpfqe0JOlZOi3ee57zgBSlL4KF9jTXcBjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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