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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0d0ebc85a5db396a6da80f5f2ea84b14fda670279ef02206475819c3b27024' 
  AND token = 'iKu/2kc8bJnnIg6YDykctBDJ2KWjpiYR+q6hfoYY1Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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