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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d19e9c26d9690c1f712ba274cbfc43ceaa7e1817d74be442173ecefc13d9c7' 
  AND token = '5o3HwHZZMXfltH2d4B8hJ/F53CN3NCEhUG+nstD67xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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