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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aba7988cdc4bfeff3f2d5c8b830cda484360786328798cba9f804e9f430e048' 
  AND token = '9kfwBjsp1IvwtwL6p6YvLsqSCSFRl3OeV3I8TH6e6So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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