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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37ead875b3aeb84383c4ca521d9f33dd65ebd63d0bd5d0a00057db360e04c00' 
  AND token = '6yGbxiFsL+oAzMGoX5u96mTJ9js9D5LkUroE0wU+qt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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