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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5275704ac631ef45b24048b8a326fd96409c50502b54092f4f719e16b62c4e7c' 
  AND token = 'ZsuJfBREl6B+0IfxGnYWRqibKsPhaZ1ykFiOBBg920w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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