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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9af28031d44378eaa19b7a743c11a4016562a85ecee6737db46cf869ef3d641' 
  AND token = 'uMTe18/EXZSt6UQM70jUbJZh1xZ3FXC3jesBCVH4qGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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