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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f629b4b9699fe5d5be0852ed50e5bcd365a31c9e7b5beba436fc31b0ea155301' 
  AND token = 'BR1jSfkzE8nx34WFPtF7f35vDG8u+jXQULwLd9xHWig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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