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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b899ddcf252dd2ef0816457a4a40e9a1800fa86f4f3fd6b1d3f92e924679e2c' 
  AND token = 'p/1OhMA07FRqbtfBNxn04bJPJ1zWvL9KItxxdOgKkB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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