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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc5e6fe9feb742acc24f1d028e99c1629b2784bfcb0d38d8899fcb1c81accc3' 
  AND token = 'aQ5aXfmUOvdoAV07JV3ow5iHRf3eM1gTl3K/s+THBW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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