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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fe6e1f3f323f510d5eb045164d3e4d200aec6a9224436b9edf2cccf476615f' 
  AND token = '7iKazMTutfZ9J0kbIyx/8KkTeQIN6p74W7aA9wObqDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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