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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1312447de9892eef7a4763b4e37f242f0e92bfdab2b9bbf9579fed3032900b0d' 
  AND token = '/hvfX0v9inUjBdHpZzj0MuL6Rc2b4o2c9tFJeL87Rc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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