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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfda2c202d818233b856f2570ed17c8d40a050517699a1e9af166c21361839c9' 
  AND token = 'suyKLkhIYx5zy3zxMh5AmqRwkmOsi6QMv2CHDsFmb/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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