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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44eb5c62d62507c2fed6f70302e00f988ac2c64ce1cee7182ff330cbeac293d4' 
  AND token = 'C0s54jd664jo9z34YtTuoLpUBnVjDgYeY1ykvp2GmBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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