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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adac64d7ad730e5d1c7c9831ff414390b652f4b6770ed100e1a4c75864e4e805' 
  AND token = '2whHDPXzcZROW//KA+VjIc/YOcTQ900P6uJ3iH8pUNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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