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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d86392e1b78990e31b19e503c179a8c09d0d078721d92d84c61d44069998472' 
  AND token = 'usw0OlwvXOeHaxeJbdewjNx9AU+izQI3LbGu/C9kApk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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