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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26858acf6ab592c99e3f5265f1e6e77e0c1de545df583d1c66d54826b3683b65' 
  AND token = 'g3rTwB/mRN15ZH0qC2Uvm1olOTsQfEph7NJbbL3+aXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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