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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0eb1ca5bc38a73b862c6c940dbc8ce55ab71fe999e09264c35bae232d8e9694' 
  AND token = 'ze4/+bKNSa4gJbvr3zj18qBM7AhQlPRJUqDUSidWdhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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