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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed3db4cf3a26cc1ca95c7a800c5c0028fef5c1130a651b5fe8196f8c88029cd' 
  AND token = '9p3eE1BP6McG3ZB2YotoAVt4cHoCS02/foPZsQNsIqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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