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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a875c87a3e71353e65d08586fb0562274e1c26949bbeeac767c596233dc265' 
  AND token = 'eypxKrin4fzX7963pwKzwnR59DA7hu/wmPqw/a+qQa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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