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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c306b2d671880803d69e876cfb38184691f42a2ea9bf3a2c80f37fa8000595b5' 
  AND token = 'P5jA1icyG9J/krQJqPoh+37/b0CpeBf+aB6TzL6qUgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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