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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89764a14aac99a3c085c1584c05e7115a6f71ca43a9be6bad0d62f7057db4fed' 
  AND token = 't+ymztGaN8JBAppfTu52IxlnLYGCpsqB73Z+mpYSsTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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