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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c9ac9fe9ae0dcff651a032b0b880f0bbfa1296bc4a4deddb073927d0ee932e' 
  AND token = '56tXGOGJpXsitGFhI4Ebum0xksMNiOdERc3FnUj/5xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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