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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115c034a15f4f346f1c0a24df42620ad36ebab37af34ec32a4226b406c4b0ac8' 
  AND token = 'RrY7f3VYErXX90K23mkpgg0mnVtKWPyJ7emwF19fAhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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