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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f71ae9c730877d402cbdba0dbdd1baa80f81d67bfd4a6a76860865f6bed059d' 
  AND token = 'WgJB2i+LIOYDSqS3SSYJZdcTQ++TbMZXjhNoWH6Q7ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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