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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f61a0da4485dce9b0bfa6724d3470a6e3df7a4c74de4ab52258f77fff2203d' 
  AND token = 'fhUx2wELvt2Dwelpr7QNZuqqu0x8AAKCCXhdoxNFekI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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