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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1b8173cb1f9834d5600c68c5f6bb3dde2f3ed8474b027746f7ad7dd0bdc733' 
  AND token = 'gF2/9SWKTFIHhPrLlSf3aYZ+k0+5n8bjhvr667svxbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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