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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f42ebc3cf0c3a22c45b17a7f6e4d3aeb760c12a0c60eae6cd7a328349ea2546' 
  AND token = '0l3KTG9g6NjEqy6qMTDhDhBt0WdZbVl6Rm0KTpkRJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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