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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671eef7c1271951336e6e83ac57cd8f2bdd57dd840ca5c5a328a56e127059878' 
  AND token = 'bV0vJ6419EohnxpY7B0L2cYEx/bN+ZS+gUuEhN9BeW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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