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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a26317269b8c7428a2ffb195aefde42a8a71ebaa702830f189bdcc2a5c2d915' 
  AND token = '38Rla6yLuKd1A9870DlhJid2Y3X/bfwdhdyWq8+qwTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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