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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effbf5398397fa1019f09f0e153677793deab782c7748c98c647940c8dff2906' 
  AND token = '8/p1XKJ61ZGv4t7eXfKuMapJWV/kEanAiNjKrn2o1+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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