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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d98816fd13237830d95ff7df20ee4a19bee1b102b587c3f6b78cafd80f3d805' 
  AND token = '9pf+c1ngUL7VRkMb46B2OMZUmF79KEL4FsznWwjtM/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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