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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b099b4a19e62d9d0973ac2194b0c8bf25813f0dcf0941934a2c30871d4c8d06' 
  AND token = 'YxRJxd4G/CIta99MFH/7OXWPiDElFajbZEp07I3neGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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