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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347bf1ef308050c7d88b0c72cfbc1478302bce91b406141d74be239abba8b9d5' 
  AND token = 'f3reuAfiCVcaKssH2B4qSHzJAd3/RrkiMQaEAL6V51A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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