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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df20b14db78a906550a4236372e0bee5bd0c4c97e807d6be43f8881c33f204b3' 
  AND token = '3sWpR+co8P4mg1TqFY5HKgRzU55NOw8sS3ReQFQf0gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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