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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5438ef5153fa89fd8a6a04330ac5d73804ae6c5d4dbeb6471ca64e74029ac87' 
  AND token = 'wv979EE44bkYSLf+PddNlWHxXP7exTS6gdayM8wcf1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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