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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff288a8e8e98d0d694c419f9692672bac49b047449fb8c540c415f6330a764e1' 
  AND token = '933wTUlmD7Jg23acxnfjS8vwX3uY+3AO2EY/eZvQPQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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