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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1ad0248b59bc13bfa325d9edce730461ad3decf57a83031e53f2048b507a54' 
  AND token = 'w6hu+UoyaZMoZIQipykDt5FT5/XwoYB44c7+X8DQTz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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