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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf92db1fc82faa79dc83cb76a7e26f70752de7637c5b255ab2b130b659f3709' 
  AND token = 'CPP6zsv2/OoJW2oDlK/XRfmwrXxfaQS/rzU+gn6rvZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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