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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bff062b64d51eb011a1c60baff5f3d6c11eece33e6d95b4f621afdbb80ff32' 
  AND token = 'jsO+7QKNuWcL9N4G9FL++0OC37afROXj+VuREV5gqRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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