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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38db062d0e47329eb26f79a715fa0d76fb054eacc5194d439162e5dc3f375e79' 
  AND token = 'oqBJ73gz+azsBkuW24ohAx77WjT5mWicryKOy8cguv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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