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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011da6207c3bb575be0877a267e6549429840ad852238d07444926583a0dc08b' 
  AND token = 'zTclPgGjkNrF94uZPISKA/HlrshWyer2XWX30NmQUz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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