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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d5f2e448419d95ef20c5211aaa3bddfb9d0e6ff4180e2f7a4fd03bbc93ddbc' 
  AND token = 'foNG+aIsyAmc1H/wA6YuKTi7cxi/m79zFgCBeGrB0aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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