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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee6fe459622efcd815f030f663ec3460256b97f97736d1b097f4dc349beb5e5' 
  AND token = 'I1x6QgMFnEsrtJ6Ou+5kHI8JxJe8hCcLbzkKq+rxa2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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