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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f246b1f1142c8d89ed2e7198f8b2a20aba791597d0d47105304f6ca889234b' 
  AND token = 'rJF5j1aMV9XUJK1OymLIzIM8+0C0jBQNeB3dQzaKSUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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